Describes how to troubleshoot problems that occur when you install, uninstall, or upgrade a program on a Windows-based computer by using Windows Installer.

If installation doesn't start automatically, browse the disc to find the program setup file, usually called Setup.exe or Install.exe. Open the file to start installation. Insert the disc into your PC, and then follow the instructions on your screen. You might be asked for an admin password.

Go to office.com/setup and sign in with an existing Microsoft account or create a new one, then enter your product key. Follow the remaining prompts to finish linking your Microsoft account with this version of Microsoft 365.

Select the Microsoft 365 folder from the virtual drive and then double-click either the Setup32.exe to install the 32-bit version of Microsoft 365, or Setup64.exe to install the 64-bit version to begin the offline installation.

Activate Microsoft 365 or a non-subscription version of Office that's pre-installed on a new Windows device. If this screen appears, a trial version of Microsoft 365 Family or a trial version of a non-subscription version of Office is installed.

Fixes an issue that “VS Shell installation has failed with exit code 1638” when a newer version Visual C++ 2015 Redistributable has installed.

Regsvr32 is a command-line utility to register and unregister OLE controls, such as DLLs and ActiveX controls in the Windows Registry. Regsvr32.exe is installed in the %systemroot%\System32 folder in Windows XP and later versions of Windows.

Software manufacturers can create the setup of their products to use Windows Installer to help make software installation, maintenance, and uninstallation straightforward and easy. Windows Installer 4.5 is released with Windows Vista Service Pack 2 (SP2) and Windows Server 2008 SP2.

Exporting your Microsoft To Do account. Enabling Microsoft To Do on a MAM managed device. Using multiple accounts with Microsoft To Do. Using Microsoft To Do in dark mode. Becoming a Microsoft To Do Insider.

Step 1: Go to www.office.com/setup or Microsoft365.com/setup. Step 2 : Sign in with your Microsoft account, or create one if you don't have one. Be sure to remember this account so that you can install or reinstall Office later, without a product key.